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At present,the satellite communication system based on Frequency Division Multiple Access has disadvantages of limited bandwidth adjustment and poor flexibility in data transmission.A new modem module architecture is designed under the framework of current FDMA communication system.The workflow of carrier adjustment is planned.According to the needs,the data ton structure suitable for the new system is designed and its reliability is verified.Communication ranging technology is adopted to analyze and calculate the time synchronization of the whole network,and the stabilityof ranging is verified.The carrier dynamic adjustment is preliminarily realized through the construction verification of the actual engineering environment.